Idle Issues, Rpm Range Issues, Car Turning Off Issues

[Jamie88]

Hey guys in a bit of a pickle with my skyline at the moment. Whenever you start it after it has been sitting for more than a few hours it coughs and splutters apon starting until you give it some revs and it comes good. I have done the following things to try to fix it...

- Spark pkugs

-Coil packs got coated in high temp silicon to prevent them arcing out

- Cleaned out my AAC valve thoroughly

Now it seems the top of piston 2 is wet and it isnt water or oil, so im guessing my injector is leaking. But I have had them all rebuilt about 8 months ago and the car has been off the road so lucky to have had 2 hours of running time since then.

Now my second issue is when you rev the car to about 3,000 rpm and hold it there it coughs and splutters but anything over or under by about 500rpm it doesnt happen. Then it has a rough idle for about 10 seconds after it returns back down to 900rpm (idle)

Do you think injector could cause both of these, or ecu issues?

Also randomly at Idle the car will turn itself off without any signs of stalling etc. Has a brand new battery. Im thinking it has something to do with my turbo timer as sometimes it wont shut my car off, you hear the relay click in the dash, and nothing happens.

Any ideas would be really good.